I am finding it very hard to solve this integration problem. Can some one explain the process step by step so that I will be able to do futher problems by myself.

Heres the question:

$\displaystyle \int\frac{1}{x\sqrt{4-9In^2(x)}}dx$

I know the solution but don't know how to get to it!

I hope this question is useful to others too.

Thanks